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From:   Xiu Jianfeng <xiujianfeng@huawei.com>
To:     <mchehab@kernel.org>, <hverkuil-cisco@xs4all.nl>,
        <laurent.pinchart@ideasonboard.com>,
        <ezequiel@vanguardiasur.com.ar>, <sakari.ailus@linux.intel.com>,
        <arnd@arndb.de>, <ribalda@chromium.org>, <andrzej.p@collabora.com>
CC:     <linux-media@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH -next] media: v4l: Use memset_after() helper
Date:   Mon, 13 Jun 2022 21:08:45 +0800
Message-ID: <20220613130845.89220-1-xiujianfeng@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

The CLEAR_AFTER_FIELD defined here is functionally the same as
memset_after() helper, so replace it with memset_after() to simplify the
code, no functional change in this patch.

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 84 +++++++++++++---------------
 1 file changed, 39 insertions(+), 45 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 21470de62d72..417e939a2b2f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -31,12 +31,6 @@
 
 #include <trace/events/v4l2.h>
 
-/* Zero out the end of the struct pointed to by p.  Everything after, but
- * not including, the specified field is cleared. */
-#define CLEAR_AFTER_FIELD(p, field) \
-	memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
-	0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
-
 #define is_valid_ioctl(vfd, cmd) test_bit(_IOC_NR(cmd), (vfd)->valid_ioctls)
 
 struct std_descr {
@@ -1481,7 +1475,7 @@ static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
 		p->mbus_code = 0;
 
 	mbus_code = p->mbus_code;
-	CLEAR_AFTER_FIELD(p, type);
+	memset_after(p, 0, type);
 	p->mbus_code = mbus_code;
 
 	switch (p->type) {
@@ -1656,7 +1650,7 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 		if (unlikely(!ops->vidioc_s_fmt_vid_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix);
+		memset_after(p, 0, fmt.pix);
 		ret = ops->vidioc_s_fmt_vid_cap(file, fh, arg);
 		/* just in case the driver zeroed it again */
 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
@@ -1666,30 +1660,30 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 		if (unlikely(!ops->vidioc_s_fmt_vid_cap_mplane))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix_mp.xfer_func);
+		memset_after(p, 0, fmt.pix_mp.xfer_func);
 		for (i = 0; i < p->fmt.pix_mp.num_planes; i++)
-			CLEAR_AFTER_FIELD(&p->fmt.pix_mp.plane_fmt[i],
-					  bytesperline);
+			memset_after(&p->fmt.pix_mp.plane_fmt[i],
+				     0, bytesperline);
 		return ops->vidioc_s_fmt_vid_cap_mplane(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 		if (unlikely(!ops->vidioc_s_fmt_vid_overlay))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.win);
+		memset_after(p, 0, fmt.win);
 		return ops->vidioc_s_fmt_vid_overlay(file, fh, arg);
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 		if (unlikely(!ops->vidioc_s_fmt_vbi_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.vbi.flags);
+		memset_after(p, 0, fmt.vbi.flags);
 		return ops->vidioc_s_fmt_vbi_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 		if (unlikely(!ops->vidioc_s_fmt_sliced_vbi_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sliced.io_size);
+		memset_after(p, 0, fmt.sliced.io_size);
 		return ops->vidioc_s_fmt_sliced_vbi_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		if (unlikely(!ops->vidioc_s_fmt_vid_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix);
+		memset_after(p, 0, fmt.pix);
 		ret = ops->vidioc_s_fmt_vid_out(file, fh, arg);
 		/* just in case the driver zeroed it again */
 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
@@ -1697,45 +1691,45 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 		if (unlikely(!ops->vidioc_s_fmt_vid_out_mplane))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix_mp.xfer_func);
+		memset_after(p, 0, fmt.pix_mp.xfer_func);
 		for (i = 0; i < p->fmt.pix_mp.num_planes; i++)
-			CLEAR_AFTER_FIELD(&p->fmt.pix_mp.plane_fmt[i],
-					  bytesperline);
+			memset_after(&p->fmt.pix_mp.plane_fmt[i],
+				     0, bytesperline);
 		return ops->vidioc_s_fmt_vid_out_mplane(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 		if (unlikely(!ops->vidioc_s_fmt_vid_out_overlay))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.win);
+		memset_after(p, 0, fmt.win);
 		return ops->vidioc_s_fmt_vid_out_overlay(file, fh, arg);
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
 		if (unlikely(!ops->vidioc_s_fmt_vbi_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.vbi.flags);
+		memset_after(p, 0, fmt.vbi.flags);
 		return ops->vidioc_s_fmt_vbi_out(file, fh, arg);
 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 		if (unlikely(!ops->vidioc_s_fmt_sliced_vbi_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sliced.io_size);
+		memset_after(p, 0, fmt.sliced.io_size);
 		return ops->vidioc_s_fmt_sliced_vbi_out(file, fh, arg);
 	case V4L2_BUF_TYPE_SDR_CAPTURE:
 		if (unlikely(!ops->vidioc_s_fmt_sdr_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sdr.buffersize);
+		memset_after(p, 0, fmt.sdr.buffersize);
 		return ops->vidioc_s_fmt_sdr_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_SDR_OUTPUT:
 		if (unlikely(!ops->vidioc_s_fmt_sdr_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sdr.buffersize);
+		memset_after(p, 0, fmt.sdr.buffersize);
 		return ops->vidioc_s_fmt_sdr_out(file, fh, arg);
 	case V4L2_BUF_TYPE_META_CAPTURE:
 		if (unlikely(!ops->vidioc_s_fmt_meta_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.meta);
+		memset_after(p, 0, fmt.meta);
 		return ops->vidioc_s_fmt_meta_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_META_OUTPUT:
 		if (unlikely(!ops->vidioc_s_fmt_meta_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.meta);
+		memset_after(p, 0, fmt.meta);
 		return ops->vidioc_s_fmt_meta_out(file, fh, arg);
 	}
 	return -EINVAL;
@@ -1758,7 +1752,7 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 		if (unlikely(!ops->vidioc_try_fmt_vid_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix);
+		memset_after(p, 0, fmt.pix);
 		ret = ops->vidioc_try_fmt_vid_cap(file, fh, arg);
 		/* just in case the driver zeroed it again */
 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
@@ -1768,30 +1762,30 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 		if (unlikely(!ops->vidioc_try_fmt_vid_cap_mplane))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix_mp.xfer_func);
+		memset_after(p, 0, fmt.pix_mp.xfer_func);
 		for (i = 0; i < p->fmt.pix_mp.num_planes; i++)
-			CLEAR_AFTER_FIELD(&p->fmt.pix_mp.plane_fmt[i],
-					  bytesperline);
+			memset_after(&p->fmt.pix_mp.plane_fmt[i],
+				     0, bytesperline);
 		return ops->vidioc_try_fmt_vid_cap_mplane(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 		if (unlikely(!ops->vidioc_try_fmt_vid_overlay))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.win);
+		memset_after(p, 0, fmt.win);
 		return ops->vidioc_try_fmt_vid_overlay(file, fh, arg);
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 		if (unlikely(!ops->vidioc_try_fmt_vbi_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.vbi.flags);
+		memset_after(p, 0, fmt.vbi.flags);
 		return ops->vidioc_try_fmt_vbi_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 		if (unlikely(!ops->vidioc_try_fmt_sliced_vbi_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sliced.io_size);
+		memset_after(p, 0, fmt.sliced.io_size);
 		return ops->vidioc_try_fmt_sliced_vbi_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		if (unlikely(!ops->vidioc_try_fmt_vid_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix);
+		memset_after(p, 0, fmt.pix);
 		ret = ops->vidioc_try_fmt_vid_out(file, fh, arg);
 		/* just in case the driver zeroed it again */
 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
@@ -1799,45 +1793,45 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 		if (unlikely(!ops->vidioc_try_fmt_vid_out_mplane))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.pix_mp.xfer_func);
+		memset_after(p, 0, fmt.pix_mp.xfer_func);
 		for (i = 0; i < p->fmt.pix_mp.num_planes; i++)
-			CLEAR_AFTER_FIELD(&p->fmt.pix_mp.plane_fmt[i],
-					  bytesperline);
+			memset_after(&p->fmt.pix_mp.plane_fmt[i],
+				     0, bytesperline);
 		return ops->vidioc_try_fmt_vid_out_mplane(file, fh, arg);
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 		if (unlikely(!ops->vidioc_try_fmt_vid_out_overlay))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.win);
+		memset_after(p, 0, fmt.win);
 		return ops->vidioc_try_fmt_vid_out_overlay(file, fh, arg);
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
 		if (unlikely(!ops->vidioc_try_fmt_vbi_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.vbi.flags);
+		memset_after(p, 0, fmt.vbi.flags);
 		return ops->vidioc_try_fmt_vbi_out(file, fh, arg);
 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 		if (unlikely(!ops->vidioc_try_fmt_sliced_vbi_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sliced.io_size);
+		memset_after(p, 0, fmt.sliced.io_size);
 		return ops->vidioc_try_fmt_sliced_vbi_out(file, fh, arg);
 	case V4L2_BUF_TYPE_SDR_CAPTURE:
 		if (unlikely(!ops->vidioc_try_fmt_sdr_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sdr.buffersize);
+		memset_after(p, 0, fmt.sdr.buffersize);
 		return ops->vidioc_try_fmt_sdr_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_SDR_OUTPUT:
 		if (unlikely(!ops->vidioc_try_fmt_sdr_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.sdr.buffersize);
+		memset_after(p, 0, fmt.sdr.buffersize);
 		return ops->vidioc_try_fmt_sdr_out(file, fh, arg);
 	case V4L2_BUF_TYPE_META_CAPTURE:
 		if (unlikely(!ops->vidioc_try_fmt_meta_cap))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.meta);
+		memset_after(p, 0, fmt.meta);
 		return ops->vidioc_try_fmt_meta_cap(file, fh, arg);
 	case V4L2_BUF_TYPE_META_OUTPUT:
 		if (unlikely(!ops->vidioc_try_fmt_meta_out))
 			break;
-		CLEAR_AFTER_FIELD(p, fmt.meta);
+		memset_after(p, 0, fmt.meta);
 		return ops->vidioc_try_fmt_meta_out(file, fh, arg);
 	}
 	return -EINVAL;
@@ -2036,7 +2030,7 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
 	if (ret)
 		return ret;
 
-	CLEAR_AFTER_FIELD(p, flags);
+	memset_after(p, 0, flags);
 
 	return ops->vidioc_reqbufs(file, fh, p);
 }
@@ -2077,7 +2071,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
 	if (ret)
 		return ret;
 
-	CLEAR_AFTER_FIELD(create, flags);
+	memset_after(create, 0, flags);
 
 	v4l_sanitize_format(&create->format);
 
-- 
2.17.1